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Oxidation of propenol on nanostructured Ni and NiZn electrodes in alkaline solution
- 1.0434969 - ÚFCH JH 2015 RIV GB eng J - Journal Article
Göransson, G. - Jirkovský, Jakub - Krtil, Petr - Ahlberg, E.
Oxidation of propenol on nanostructured Ni and NiZn electrodes in alkaline solution.
Electrochimica acta. Roč. 139, SEP 2014 (2014), s. 345-355. ISSN 0013-4686. E-ISSN 1873-3859
Institutional support: RVO:61388955
Keywords : electrodeposition * DEMS * pulse plating
Subject RIV: CG - Electrochemistry
Impact factor: 4.504, year: 2014
DOI: https://doi.org/10.1016/j.electacta.2014.06.169
Oxidation of propenol on nanostructured pulse plated Ni and NiZn alloys in alkaline solution gives the corresponding aldehyde, propenal, as the major product. The process is redox mediated by the NiOOH/Ni(OH)(2) couple and starts as soon as NiOOH is formed on the surface. Depending on the applied potential, propenol oxidation takes place in parallel with water oxidation. The latter requires a higher surface concentration of NiOOH compared to propenol oxidation, indicating that a binuclear mechanism for oxygen evolution prevails at low overpotentials. The redox reaction of nickel oxide is markedly slower at the NiZn alloy than for solid Ni or pulse plated Ni, which also is reflected in the oxidation of water and propenol. Separation of all three oxidation currents (Ni(OH)(2), water and propenol) shows that pulse plated Ni is more efficient as catalyst than NiZn per NiOOH site, for both water and propenol oxidation. The role of Zn ions in the mixed NiZn hydroxide is discussed and a mechanism for propenol oxidation is suggested. (C) 2014 Elsevier Ltd. All rights reserved.
Permanent Link: http://hdl.handle.net/11104/0238900
Number of the records: 1